I would very much appreciate a copy of your demo if you can locate it.
Thanks for the offer.
I was going to write up a limited dummy dll for proof of concept.
If that did not work, try COM.
I have a text "Delphi COM Programming" by Eric Harmon buts its pretty
ancient (but then so is the Delphi code I am looking at)
I have not had much exposure to COM. My only endeavour has been to write
one using C# for use by Access VBA. That was a very simple hash function
for passwords. It worked ok but I don't think they have ever used it.
On 15/12/2010 5:03 PM, Matt Siebert wrote:
Hi Peter,
I found myself in a similar situation a while ago (wanting to pass
strings between a Delphi DLL and .NET).
There was something slightly tricky about strings but it wasn't too
bad. I think I did something with allocating memory which may be
similar to your need to store the xml in memory on the Delphi side.
Unfortunately I can't remember the details right now and I've since
changed jobs. I remember making a demo app in my spare time as a
proof of concept before implementing it at work. I'll have a look for
the demo app tonight and let you know.
Cheers,
Matt.
On Wed, Dec 15, 2010 at 4:00 PM, Peter Maddin <petermad...@aapt.net.au
<mailto:petermad...@aapt.net.au>> wrote:
I have some cipher units written for Delphi 7.
These are fairly complex (at least for me). They contain methods
(sorry functions and procedures) for the elliptic curve asymmetric
cipher, The Rijndael symmetric cipher and the SHA-1 hash.
The system that uses these is using file downloads and uploads
using Delphi 7 Isapi dlls.
The system while working, is suffering congestion problems
especially with uploads.
What I would like to use is WCF web services to handle data
downloads and create local server files from parameters sent to
the WCF web service on the server rather than perform uploads (the
file contents is very small).
Writing the WCF should not be too much of a challenge but I need
to use the delphi code to handle decryption/encryption.
I thought of writing a Win32 dll for the encryption logic called
from C# WinForms (or maybe WPF) application.
Has anyone done this sort of thing before? I understand that value
types are ok to exchange but reference types are a pain, this
includes strings.
I have googled and there is a fair bit out there. Most of this is
dealing with the pain of trying do it.
I only need to exchange ints, bools and strings. Nothing too fancy.
Has anyone some sample code they would be willing to share?
Also I would like be able call a method in the dll to store
information in memory to be used by other method calls. This
information is stored in an xml file and I would rather it be read
and processed once rather than repeat this each time I need to use
a method. In other words in using delphi dll, will it preserve
state between method calls?
If I can't get the dll to work I will fall back on the
crypographic support in the framework but this basically triples
the effort required and data encrypted by the current system will
not be compatible with the framework cryptographic routines.
Any help very much appreciated.
